How to get information about the current user of my app?

[AntonReact]

Hello everybody,

I am currently building my first App with Shopify CLI (NodeJS, React, NextJS) and connected my app to the Shopify system.

I built a FAQ app where merchants can create FAQs for their shop. 

I am storing the FAQs in a database and I need a way to tell which merchant created which FAQs.

What can I do for that? This should be a common problem but I didnt find the right solution for that.

I appreciate every help!